Transfer device



Dec. 10, 1968 ANDERSON ET AL 3,416,107

TRANSFER DEVI CE Filed Jan. 12, 1966 3 Sheets-Sheet l EMERGEAK' R. 5. ANDERSON ET AL TRANSFER DEVICE 3 Sheets- 2 Filed J n- 1966 Dec. 10, 1968 Filed Jan. 12, 1966 ER/Z ER/I

I I inn NR/3 NR/S R. G. ANDERSON E AL TRANSFER DEVICE 3 Sheets-Sheet 3 TDEN I I I TONE/2 TDNE VIRI I i'DEN/I T FlG.5b

; TONE/1 United States Patent Claims ABSTRACT OF THE DISCLOSURE A transfer device comprises a pair of circuit interrupters supported in a side-by-side relationship, an actuating member supported for pivotal movement and a motor mechanism operable to pivot the actuating member to operate the circuit interrupters in order to transfer from one power supply to another power supply.

Transfer switches are used in situations where load must be transferred from a normal supply to an emergency supply upon failure of the normal supply. They should .also provide for the return of the load to the normal supply upon its recommencement.

Previous transfer switches have been arranged to provide these functions but in general their design has been based upon the use of solenoids to operate the circuit breakers. Solenoids have an extremely rapid acceleration unless specially designed. As a result they expose the breaker mechanism to excessive accelerations and shocks. Transfer switches using solenoids therefore are usually designed around the solenoids and utilize special circuit interrupting mechanism which will withstand the shock of solenoid operation. It is not generally satisfactory to use standard circuit breakers in such a transfer switch because of the shocks to which they are exposed. With solenoid operation it is also necessary to provide a mechanical interlock between the circuit interrupting mech anisms. Since the solenoids are individual and separate items and each is associated with its own electrical system, it is evident that the mechanical interlock is an attempt to produce a mechanical correlation between two separate electrical systems. Failure of either of the electrical systems will give rise to large forces causing great strains on the mechanical interlock and necessitating extremely rugged design for the mechanical portion.

It is therefore an object of this invention to provide an improved form of transfer mechanism.

It is a further object of this invention to provide a transfer mechanism which does not permit the simultaneous connection of both standby and normal supply to load circuits but inherently prevents such operation.

It is a further object of this invention to provide a transfer switch which has a relatively uniform acceleration pattern and a gradually increasing velocity character, thus freeing the circuit interrupting means from shock during operation.

These and other objects are attained by providing a unidirectional driving motor for operating the circuit breakers in accordance with electrical signals and controls as provided and cam means for converting the rotary motion of the driving motor to a linear reciprocating motion, whereby the operators of the circuit breakers are positively driven in mutually opposite directions at the same time.

It is further provided that the driving force for the mechanical portion of the system may alternatively be provided manually without energization of the driving motor.

A clearer understanding of our invention may be had from the following specification and drawings in which:

FIGURE 1 is a plan view of the whole transfer switch assembly;

FIG. 2 is a view of various switch;

FIG. 3 is a view of the preferred driving disc of this invention;

FIG. 4 is a view of an alternate disc usable with the present invention;

FIG. 5a is a schematic diagram of the control portion of the switch; and

FIG. 5b is a key sheet for FIG. 5a showing the relationship of the various relays and contacts.

Referring now to the attached drawings and FIG. 1 in particular, there is shown a base plate 5 on which is mounted a pair of circuit interrupters or circuit breakers 6 and 7 which are connected to a normal supply and an emergency supply through buses 8, 9, 10, 11, 12 and 13 respectively. The other terminals of both the circuit breakers 6 and 7 are connected to a through wire output bus and from thence connected to a load through terminals 14, 15 and 16.

A box 17 mounted on baseboard 5 containing a suitable gear motor 18 (FIG. 5a) and brake (not shown in FIG. 1) drives disc 19 at a reduced speed. Disc 19 may be fabricated or cast from a suitable plastic or metal. Disc 19 is normally attached to the output drive shaft of gear motor 18 by means of a keyway or suitable set screws.

A fabricated actuating member or toggle lever 20 is mounted on a suitable pivot 21 (not shown in FIG. 1) for rotation in a plane parallel to that of baseboard *5. The toggle lever 20 is attached to pivot 21 by means of bolt 22 and washer 23 as best shown by FIG. 2. Pivot 21 may have a shoulder portion 24, or part 24 may be a separate bushing firmly secured to pivot 21 by bolt 22.

Toggle lever 20 is provided with a pivot aperture 25 which is of slightly larger bore than shoulder 24 in order to provide a good sliding bearing for aperture 25. It will also be required that shoulder 24 be of slightly greater thickness than the thickness of toggle lever 20 in the vicinity of aperture 25. This will permit rotation about pivot 21 in a plane parallel to base 5 but prevent rotation in any other plane.

Toggle lever 20 is provided with two more apertures 26 and 27 in which are received circuit breaker operating members on tripping handles 28 and 29. The apertures 26- and 27 are purposely made to be a loose fit .and handles 28 and 29 so that no binding between the apertures 26 and 27 and handles 28 and 29 can occur during operation. As can be seen in FIGURE 1, the circuit breakers 6 and 7 .are positioned such that the on positions are adjacent and the oif" positions are adjacent. Although, as will be hereinafter described, the circuit breakers 6 and 7 are not operated to the on" positions together or to the offpositions together, they are positioned on the base plate 5 such that the direction of movement of the operating members 28, 29 to the on positions thereof is the same and the direction of movement of the operating members to the off positions thereof is the same.

A pair of spring members 30 and 31 are provided in components of the transfer toggle lever to urge the respective circuit breaker handles in a downward direction. Springs and 31 are held in position by posts integrally cast in lever 20 as best shown in FIG. 2.

In the right hand portion ofthe lever 20- a closed slot 32 is formed. Slot 32 is provided such that the end portion 33 of driving pin 34 may easily pass therethrough and slide therein. Pin 33 is arranged to fit into a pin receiving aperture 35 in disc 19 in a sliding fit, Pin 33 is arranged to fit into disc 19 a distance almost equal to the thickness of disc 19 so that pin 33 passes almost through disc 19.

It will be seen from FIG. 3 that disc 19 is made to have a pair of cams 36 and 37 which are used to actuate a pair of limit switches enclosed in box 38 which serve to provide a means of indication of the position of toggle lever 20 as well as providing means to stop toggle lever 20 at either of two stationary positions.

With reference to the toggle lever 20 as shown in FIG. 2 it will be seen that the cross section of the lever is generally U-shaped having closed ends somewhat akin to a shallow trough. Lever 20 is arranged to have a cover 39 which has a U-shaped cross section which is arranged.

to pivot about a hinge at one end of the lever 20, the hinge is provided by pin 40 which passes through the appropriate holes in lever 20 and cover 39. Pin 40* may be held in place by a key 41 as shown.

Cover 39 may be held closed by any suitable means, the method chosen here consists of punching a portion of the metal in cover 39 inwardly as at 42 to mate with depressed area 43 in lever 20.

The lever and cover are designed in such a manner as to provide sufficient space between the cover and the bight of the U-shaped cross section of the toggle lever in the region of slot 32 for the head of pin 34 to fit in this provided recess and yet provide enough space to allow part 33 of pin head 34 to slide in recess while assuring that pin part 33 remains in slot 32.

It will be seen that in ordinary circumstances pin 33 passes through slot 32 in lever 20 into hole 35 of disc 19. If however, it is desired to mechanically disconnect the lever 20 and disc 19 the pin 34 may be removed by pulling it out of the recess in lever 20 and inserting pin 33 into aperture 44 in cover 39 and subsequently closing cover 39.

Mechanical operation When motor 18 is energized disc 19 is rotated in a clockwise direction at reduced speed by means of appropriate gears. As disc 19 revolves pin 34 also moves in a circular path causing the portion of lever 20 to the right of bolt 21 to move upward and the corresponding left portion of the lever 20 moves downward. Spring 30- engages the trip arm 28 of breaker 6 to assure that breaker 6 trips off before trip arm 29 of breaker 7 trips on. Springs 30 and 31 provide the needed mechanical interlock to assure that for a brief period both breakers are off before the second breaker becomes energized. Disc 19 continues to rotate and in this instance breaker 7 would be tripped on and cam 36 would engage the appropriate limit switch in box 38 to deenergize the motor 18 and engage a brake on the motor to stop the disc 19 with cam 36 at the position of cam 37 in FIGURE 1.

It willbe noted that exactly the same sequence follows when deenergizing breaker 7 and energizing breaker 6. The spring 31 assures that breaker 7 is deenergized before breaker 6 is energized. Gear motor 18 continues to rotate until cam 37 has reached the position shown in FIGURE 1 and has engaged the appropriate limit switch in box 38.

I'tlwill be seen that due to springs 30 and 31 the closed breaker is set in motion before the open breaker thus ensuring that both breakers are never closed simultaneously. As was previously set forth, the mechanical interlock provides that during operation of the transfer switch there will be a brief period when the two breakers will be simultaneously off. The construction and positioning of parts are such that in the rest position the handle of the breaker in the off position will be spaced a slight distance, for example three-sixteenths of an inch, from the adjacent actuating edge of the lever 20 at the associated opening 26 or 27, and the handle of the breaker in the on position will be engaged by the associated actuating spring 30' or 31. The springs 30 and 31 are strong enough that when the associated breaker is on and the lever 20 is actuated the spring associated with the on breaker will start to move the associated breaker handle immediately upon movement of the lever 20. Movement of the handle of the breaker in the off position will be delayed until the lever 20 has moved far enough to take up the hereinbefore mentioned space between the handle and the adjacent actuating edge of the lever 20 at the associated Opening. Thus, the breaker that is being operated from the on to the oil position will be actuated before the breaker that is being operated from the off to the on position and there will be a brief period during each operation of the transfer switch when the two breakers will be simultaneously off.

In order to provide for moving toggle lever 20 manually cover 39 of lever 20 is swung open to reveal pin 34 in the recess of lever 20. Pin 34 is removed from the recess and end 33 of pin 34 is inserted in aperture 44 in cover 39. Cover 39 is then closed and since the right hand end of the lever has been disengaged from disc 19 the lever may be moved up or down to energize and deenergize breakers 6 and 7 as desired.

It is immediately obvious that simple markings on the breakers 6 and 7 will indicate the state of energization of each breaker.

Electrical system Let us now consider the electrical system which is illustrated in FIGURE 5a together with the key diagram 5b. In FIGURES 5a and 5b the relay designations are given as letters for example NR, VR1, etc., while their associated contacts are given as NR/ 1, VRI/ 1, etc. It will be understood that NR/ 7 for example is contact seven of relay NR. The mechanical correlation of contacts and relays as shown in FIGURE 5b which enables the contacts of any relay to be quickly located by examining FIGURE 5b, finding the contact and reading across to FIGURE 5a to find the location of the contact in the circuit.

In FIGURE 5a there are shown a series of normal supply terminals 8, 9 and 10 and emergency supply terminals 11, 12 and 13, both of which are connectable through circuit breakers 6 and 7 to the load terminals 14, 15 and 16. Connected across the normal supply terminals 8, 9 and 10, are a pair of transformers 50 and 51. The secondaries of these transformers are connected in series to conductors 52 and 53. The tertiaries of these transformers are utilized to energize relay coils 54, 55 and 56 of voltage sensitive relays designated VR1, VR2 and VR3. The contacts of these voltage sensitive relays designated VR1/ 1, VR2/1 and VR3/1 are arranged in series from conductor 52 to the coil 57 of relay designated TDEN and through normally closed contacts NR/l to conductor 53. A path also exists from the voltage sensitive relay contacts through the coil 58 of relay NR and also the coil 59 of relay TDNE through normally closed contacts ER/ 1 to conductor 53.

Contacts NR/ 2 which are normally open and TDEN/1 which are normally open are in parallel with contacts ER/ 1 which are normally closed.

Motor 18 is supplied from conductors 52 and 53 through contacts NR/3 and fuse 60 through motor 18, emergency pushbutton 61, contacts NLS, NR/4, NAS to conductor 52. Pushbutton 61 is normally closed but may be locked open. Similarly test pushbutton 62 which connects conductor 52 to the secondaries of transformers 50 and 51 is normally closed but may be pushed open.

The output from the secondary of transformer 60 is applied to conductors 62 and 63 and may be used alternatively to the supply motor 18. Under these circumstances the circuit for motor 18 is as follows:

Conductor 62, contact ER/Z, NR/ 5, EAS, fuse 60, m0- tor 18, pushbutton 61,-ELS, NR/ 6 to conductor 63.

Also connected between conductors 62 and 63 are the coil 69 of the frequency sensitive relay FR and the coil 64 of relay ER, the latter coil being in series with the contacts FR/l ofrelay FR, contacts SS/2 of the selector switch and contacts TDNE/2 of relay TDNE, the time delay normal to emergency relay. Also across conductors 62 and 63 is a'signal light 65 in series with contacts ES. Across conductors 52 and 53 is a signal light 66 in series with contacts NS. Further contacts for controlling the operation of the diesel auxiliary generator are shown at the lower portion of this circuit diagram and include contacts 55/ 4 and in parallel therewith contacts 88/ 3, NR/ 7, TDNE/1 in series. In order that the diesel shall start, it is necessary that one of these arrangements provide a continuous circuit between terminals 67 and 68.

Opelratiom of the electrical system The schematic diagram is shown under conditions with no normal or emergency supply available, with both breakers open and all relays deenergized.

Let us now assume that power is being supplied on the normal terminals 8, 9 and 10. Relays VRl, VR2 and VR3 are energized. Contacts VRl/ 1, VR2/ 1, and VR3/1 close. Contact ER/l was closed, energizing NR. NR/l opens and TDEN is not energized. Contacts NR/3 and NR/4 close, NLS is closed because circuit breaker 7 is open. NAS is closed if breaker 7 is not tripped.

Assuming contacts SS/l of the selector switch are closed and pushbutton TPB is closed, the circuit is complete. If emergency pushbutton 61 has not been operated, motor 18 is energized and starts to rotate. As it rotates, it operates breaker 7 and it continues to rotate until breaker 7 is closed, opening contact NLS. Contact NR/7 is of course open and therefore the diesel start circuit is not operating.

Let us now assume that the normal supply fails. If any one of the terminals 8, 9 and 10 does not provide the suitable voltage, then relay VR1, VR2 or VR3 opens. The voltage at which these relays open is dependent upon their adjustment and may be adjusted to any desired voltage level. When one of the contacts VR1/ 1, VR2/1 and VR3/1 opens, relay NR is deenergized. Contact NR/7 closes and the diesel start circuit is completed when relay TDNE times out and closes contacts TDNE/1. Voltage will then appear on terminas 11, 12 and 13. This supplies a voltage to transformer 60 which in turn provides a suitable voltage to conductors 62 and 63. Relay FR is a frequency sensitive relay and closes when the frequency supplied by conductors 62 and 63 reaches the desired fre quency. When relay FR picks up contacts, FR/l close and assuming contacts 88/ 2 to be closed, and contacts TDNE/ 2 to be closed because relay TDNE has timed out, the coil 64 of relay ER is energized. Contact NR/6 is closed because relay NR has been deenergized, contact ELS is closed because-circuit breaker 6 is open, pushbutton 61 is not operated, contact ER/2 is closed because relay ER has been energized, contact NR/S is closed because relay NR is deenergized, contact EAS is closed assuming breaker 6 has not been tripped by an overload. Therefore the circuit for motor 18 is complete through NR/ 6, ELS, pushbutton 61, motor 18, EAS, NR/S, ER/2 causing the motor to rot-ate until breaker 7 opens and breaker 6 closes causing contacts ELS to open and deenergize the motor.

It now a normal supply reappears on terminals 8, 9 and 10, relays VRl, VR2 and VR3 will reenergize closing contacts VRl/ 1, VR2/1 and VR3/ 1. Relay TDEN will be energized through contacts VR2/1, VR3/1 and VRl/l and contact NR/l since relay NR is not energized. This latter relay is not energized because contacts NR/ 2, ER/l and TDEN/1 are not closed. NR/Z is open because NR is not energized, ER/l is open because relay ER is still energized from the emergency source and TDEN/1 is open because the relay TDEN is timing out. After a specified length of time determined by the setting of the time delay of relay TDNE. The energization of relay NR causes contacts NR/5 and NR6 to open but closes contacts NR/3 and NR/4. Since breaker 7 is open, contact NLS is closed and motor 18 is energized until such time as breaker 7 is closed, opening contact NLS. With the closing of breaker 7, breaker 6 is open. The opening of contacts NR/6 and NR/S prohibit further operation of the motor from conductors 62 and 63. At the same time that relay NR is energized relay TDNE is energized through contacts NR/2. Contacts NR/2 lock in relay NR. The opening of contacts TDNE/1 and contacts NR/ 7 due to energization of these relays ensures that the diesel circuit is open and the diesel is shut down. The picking up of relay TDNE open circuits the coil energization circuit of relay ER and deenergizes this relay. The energization of relay NR also open circuits contacts NR/l causing relay TDEN to be deenergized and reset to zero which also causes contacts TDEN/1 to open, relay NR, however, has been locked in by contacts NR/Z. It will be noted that the indicator lights 57 and 58 are operated by subcontacts ES and NS respectively. These contacts are on the breakers 6 and 7 and open when the breaker opens. The pilot or indicator lights therefore indicate which of the breakers is closed. The contacts 88/1, 88/2 and 88/4 are contacts on a selector switch which may be used to cause the transfer switch to operate through certain functions primarily for test purposes. For example closure of contacts SS/4 can be used to ensure the operation of the diesel and test its starting operation. Opening contacts SS/l can cause the operation of the transfer switch corresponding to a failure of normal supply. Opening contacts SS/2 can cause an operation of the transfer switch corresponding to a failure of the emergency supply. Operation of contacts SS/3 can prohibit the starting of the diesel circuit even though the contacts SS/l have indicated a failure of normal supply.

Obviously many of the special provisions in this circuit may be eliminated in a more simplified version. For example where the circuit breakers utilized do not have overload trips, there is no necessity for contacts EAS or NAS. Where there is no desire for indicator lamps 65 and 66 there is no necessity for auxiliary switches ES and NS on the circuit breakers. Where it is not desired to delay the operation of the diesel, there is no necessity for switch TDNE and its contacts such as TDNE/1, /2, etc. Test pushbutton TPB may also not be required. Relay 69, the frequency sensitive relay, may also be eliminated if the load is not unduly affected by frequency variations. It will, however, be evident that certain relays are absolutely necessary to the system such as relays NR and ER. Relay TDEN is advisable to that unnecessary transfers will not occur and pushbutton 61 is useful to override the electrical system and permit wholly manual operation.

We claim as our invention:

1. A transfer device comprising a pair of circuit interrupters, each of said circuit interrupters comprising an operating member movable between an off position and an on position to open and close the interrupter, means supporting said circuit interrupters in a side-by-side relationship with said circuit interrupters positioned such that the on positions of the operating members are adjacent and the o positions of the operating members are adjacent, an elongated actuating member supported for pivotal movement about a pivot positioned intermediate the ends of said actuating member, connecting means connecting said actuating member with said operating members, a motor mechanism, means operatively connecting said motor mechanism tosaid actuating member, upon "a"fi"rst operation of said motor mechanism said actuating member being pivoted to a first position to operate one of said circuit interrupters to the off position and the other of said circuit interrupters to the on position, and upon a second and successive operation of said motor mechanism said actuating member being pivoted to a second position to operate said one circuit interrupter to the on position and said other circuit interrupter to the off position.

2. A transfer device according to claim 1, and said connecting means between said actuating member and said operating members providing that during each operation of said transfer device the operating member going to the off position will move before the operating member going to the on" position moves.

3. A transfer device according to claim 1, a base plate, said circuit interrupters being mounted on said base plate, said actuating member being supported to pivot about an axis normal to the plane of said base plate and disposed between said circuit interrupters, said motor mechanism being mounted beside said pair of circuit interrupters and being connected to said actuating member in proximity to one end of said actuating member.

4. A transfer device according to claim 3, said motor mechanism comprising a unidirectional motor.

5. A transfer device according to claim 1, and means for disconnecting said motor mechanism from said actuating member to permit manual operation of said actuating member independent of said motor mechanism.

6. A transfer device according to claim 1, said actuating member having opening means therein, said operating members extending into said opening means, and spring means supported on said actuating member in proximity to said opening means and engaging said operating members during operation of said transfer device.

7. A transfer device according to claim 3, said actuating member having a pair of openings therein, each of said operating members being disposed in one of said open ings, a pair of springs supported on said actuating member with each of said springs being disposed in proximity to a different one of said openings to engage the associated operating member, the construction and positioning of said actuating member and operating members and circuit interrupters being such that in the rest position the handle of the circuit interrupter in the off position will be spaced from the adjacent actuating edge of the actuating member at the associated opening and the operating member of the circuit interrupter in the on position will be engaged by the associated spring so that upon operative movement of said actuating member the spring associated with the operating member in the on position will move the associated operating member immediately upon movement of the actuating member and movement of the operating member in the off position will be delayed until the actuating member has moved far enough to take up the space between the operating member in the off position and the actuating edge of the actuating member at the associated opening.

8. A transfer device according to claim 1, said motor mechanism being mounted beside said pair of circuit interrupters and comprising a drive wheel rotatable upon actuation of said motor, said actuating member having an elongated slot in proximity to one end thereof, a drive pin disposed in said slot and connected to said drive wheel to operatively connect said drive wheel with said actuating member, and upon operation of said motor said drive wheel operating said drive pin in said slot to operate said actuating member.

9. A transfer device according to claim 8, and said drive pin being removably connected to said drive wheel whereby said drive pin can be disconnected to disconnect said actuating member from said motor mechanism to thereby permit manual operation of said actuating member independent of said motor mechanism.

10. A transfer device according to claim 9, said actuating member comprising an elongated member generally U-shaped in cross section and an openable cover closing the opening between the legs of said elongated U-shaped member, and said drive pin in the connected position comprising a first part disposed under said cover within the confines of said elongated U-shaped member and a second part extending out through said slot which second part is removably mounted in an opening in said drive wheel.

11. A transfer device comprising a pair of circuit interrupters, each of said circuit interrupters comprising an operating member movable between an off". position and an on position to open and close the interrupter, a base plate, means supporting said circuit interrupters on said base plate in a side-by-side relationship with said circuit interrupters being positioned such that the direction of movement of said operating members to the off positions there of is the same and the direction of the movement of said operating members to the on positions thereof is the same, an actuating member supported for pivotaLmovement, connecting means operatively connecting said actuating member with said operating members, a motor mechanism comprising a unidirectional motor, meansoperatively connecting said motor mechanism to said actuating member, upon a first operation of said motor mechanism said actuating member being pivoted to a first position to operate one of said circuit interrupters to the off position and the other of said circuit interrupters to the on position, and upon a second and successive operation of said motor mechanism said actuating member being pivoted to a second position to operate said one circuit interrupter to the on position and said other circuit interrupter to the off position.

12. A transfer device according to claim 11, said actuating member being supported to pivot generally along a plane and about an axis extending generally normal to said plane which axis is disposed between said circuit interrupters, said motor mechanism being mounted beside said pair of circuitinterrupters and being connected to said actuating member in proximity to one end of said actuating member.

13. A transfer device according to claim 12, and means for disconnecting said motor mechanism from said actuating member to permit actuation of said actuating member independent of said motor mechanism.

14. A transfer device according to claim 11, and said connecting means between said actuating member and said operating members providing that during each operation of said transfer device the operating member going to the off position will move before the operating member going to the on position moves.

15. A transfer device according to claim 12, said motor mechanism being mounted beside said pair of circuit interrupters and comprising a drive wheel rotatable upon actuation of said motor, said actuating member having an elongated slot in proximity to one end thereof, a drive pin disposed in said slot and connected to said drive wheel to operatively connect said drive wheel with said actuating member, upon operation of said motor said drive wheel operating said drive pin in said slot to operate said actuating member, and said drive pin being removable from said drive whel to permit manual operation of said actuating member independent of said motor mechanism.

16. A transfer device according to claim 12, said ac tuating member having a pair of openings therein, each of said operating members being disposed in one of said openings, a pair of springs supported on said actuating member with each of said springs being disposed in proximity to a different one of said openings to engage the associated operating member, the construction and positioning of said actuating member and operating members and circuit interrupters being such that in the rest position the handle of the circuit interrupter in the off position will be spaced from the adjacent actuating edge of the actuating member at the associated opening and the operating member of the circuit interrupter in the on position will be engaged by the associated spring so that upon operative movement of the said actuating member the spring associated with the operating member in the on position will move the associated operating member immediately upon movement of the actuating member and movement of the operating member in the off position will be delayed until the actuating member has moved far enough to take up the space between the operating member in the off position and the actuating edge of the actuating member at the associated opening.

References Cited UNITED STATES PATENTS Scott 335161 Scott 335-161 Soos a 335161 8005 335-9 Soos 33511 BERNARD A. GILHEANY, Primary Examiner. ]0 H. BROOME, Assistant Examiner. 

